Convert subtitles — SMI ↔ SRT ↔ VTT, sync adjustment

Convert old SMI subtitles into SRT or VTT that YouTube, smart TVs, and media players can read, or adjust the timing when subtitles run ahead of or behind the video.

The file is never sent to a server — processed entirely in this browser

How to use Convert subtitles

1Select a subtitle file (encoding is auto-detected).
2Choose a save format, and if the sync is off, enter a shift value in seconds.
3Check the preview, then save.

Frequently asked questions

My SMI file has both Korean and English.

Choose a language inside the SMI file (KRCC, ENCC, etc.) to save only that language.